package com.zznzzn.myweb.config;


import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;

import java.nio.charset.StandardCharsets;

@Configuration
public class HttpMessageConverterConfig {


    /**
     * 使用fastjson 代替默认的jackson 进行转换
     * @return
     */
    @Bean
    public HttpMessageConverters fastJosnMessageConverter(){
//      -->  HttpMessageConverters(new FastJsonHttpMessageConverter(new FastJsonConfig()));

        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();

        SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                //    输出key是包含双引号
//                SerializerFeature.QuoteFieldNames,
                //    是否输出为null的字段,若为null 则显示该字段
                SerializerFeature.WriteMapNullValue,
                //    数值字段如果为null，则输出为0
                SerializerFeature.WriteNullNumberAsZero,
                //     List字段如果为null,输出为[],而非null
                SerializerFeature.WriteNullListAsEmpty,
                //    字符类型字段如果为null,输出为"",而非null
//                SerializerFeature.WriteNullStringAsEmpty,
                //    Boolean字段如果为null,输出为false,而非null
                SerializerFeature.WriteNullBooleanAsFalse,
                //    Date的日期转换器
                SerializerFeature.WriteDateUseDateFormat,
                //    循环引用
                SerializerFeature.DisableCircularReferenceDetect,
        };
        fastJsonConfig.setSerializerFeatures();

        fastJsonConfig.setCharset(StandardCharsets.UTF_8);



        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);


        return new HttpMessageConverters(fastJsonHttpMessageConverter);

    }

}
